"Extreme Weight Loss" (8 p.m., ABC): Tonight's episode follows the sad tale of a 46-year-old widow of a military veteran. Her husband returned from Afghanistan with PTSD and eventually took his own life. Now, she is seeking a fresh start.

"History Detectives Special Investigations" (9 p.m., PBS): The franchise kicks off Season 11 with a new format that focuses on one iconic mystery per episode. Up first: the 1865 explosion of the SS Sultana, a Mississippi steamboat packed with Union soldiers.

"The Night Shift" (10:01 p.m., NBC): The medics have their hands full when a horrific crash sends dozens of soldiers, including Drew's (Brendan Fehr) boyfriend, to the emergency room.